Advancing the fabrication of YSZ-inverse photonic glasses for broadband omnidirectional reflector films

Rosário, Jefferson J. do; Häntsch, Yen; Pasquarelli, Robert M.; Dyachenko, P. N.; Vriend, Eleonora; Petrov, Alexander Yu.; Furlan, Kaline P.; Eich, Manfred; Schneider, Gerold A.

doi:10.1016/j.jeurceramsoc.2019.04.028

Cited by 10 publications

(11 citation statements)

References 43 publications

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“…The reason for that is the proven better performance in terms of radiation reflection over a broadband range for disordered, PhGs, than ordered, photonic crystal structures. [6,7] Therefore, in our work the writing velocity is not restricted to the crystal growth rate. Instead, we aimed for faster writing velocities to achieve amorphous particle assemblies.…”

Section: Single Line Printingmentioning

confidence: 99%

“…[4] Next to thermal management in highpower electronics, thermal shielding in high-temperature applications requires consistent enhancement toward higher working temperatures: here, next-generation reflective thermal barrier coatings (rTBCs) with tailored microstructures have lower thermal conductivity in comparison to traditional TBCs, [6] but most importantly are capable of additionally scatter heat radiation. [7] The emittance of heat radiation scales with temperature by T 4 , hence obstructing radiative heat transport becomes very relevant with increasing working temperatures (>1000 °C). Therefore, coating components for high-temperature applications with such rTBCs could allow the devices to work at higher operating temperatures.…”

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confidence: 99%

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Printing Crack‐Free Microporous Structures by Combining Additive Manufacturing with Colloidal Assembly

et al. 2022

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strategies. [4] Here, on-chip microfluidics could aid to effectively remove heat. [4] This requires processing techniques with great design and material flexibility. However, current processes for microfluidics rely mainly on lithography techniques, which are limited in materials selection and restricted to rather 2D designs. [5] Hence, the development of novel processing routes is required that allow design flexible processes such as AM and greater materials variety. [4] Next to thermal management in highpower electronics, thermal shielding in high-temperature applications requires consistent enhancement toward higher working temperatures: here, next-generation reflective thermal barrier coatings (rTBCs) with tailored microstructures have lower thermal conductivity in comparison to traditional TBCs, [6] but most importantly are capable of additionally scatter heat radiation. [7] The emittance of heat radiation scales with temperature by T 4 , hence obstructing radiative heat transport becomes very relevant with increasing working temperatures (>1000 °C). Therefore, coating components for high-temperature applications with such rTBCs could allow the devices to work at higher operating temperatures.

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Section: Single Line Printingmentioning

confidence: 99%

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confidence: 99%

Printing Crack‐Free Microporous Structures by Combining Additive Manufacturing with Colloidal Assembly

et al. 2022

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“…Moreover, these morphological changes have a direct impact on the macropores structures' properties, thus may hinder their final function. We have been developing ceramic-based macroporous structures for high-temperature photonic applications, 18,20,22,35,43 which are capable of reflecting thermal radiation whilst also reducing the heat conduction by its highly-porous structures. It is a challenge, however, to keep the threedimensional ordered structure stable at high temperatures (>1000 • C) and yet functional.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the role of shell thickness and pore size on the mechanical properties of ceramic‐based macroporous structures

et al. 2022

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Macroporous structures are of interest for several technological applications such as catalysis, sensors, filters, membranes, batteries, energy conversion devices, structural colors, and reflective thermal barrier coatings. Ceramic‐based inverse opal macroporous structures are especially interesting for high‐temperature applications. However, the interrelation between the structural parameters, mechanical properties, and thermal stability of such structures is not yet clarified. In this work, we analyzed the mechanical properties as well as the thermal stability of aluminum oxide inverse opal three‐dimensional macroporous structures with different macropore sizes and shell thicknesses produced by atomic layer deposition. Our results show that the structures’ thermal stability increased with increasing shell thickness and macropore size, however, their higher stability was not linked to their mechanical properties. To be able to explain this unexpected behavior, finite element modeling simulations were performed, showing that bending stresses became more pronounced with increasing shell thickness, potentially creating additional critical sites for crack initiation and consequent structural failure.

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“…Bio-inspired synthetic photonic crystals and glasses make use of this selectivity in the reflection of the spectrum, while expanding the spectral range to ultraviolet and infrared. Thus, applications not only as structural colors [ 2 , 3 , 4 , 5 , 6 ] but also as broadband reflectors [ 7 ], optical filters, thermal emitters for thermophotovoltaics [ 8 ], and in radiative cooling [ 9 , 10 ] are demonstrated. In a broader context, photonic crystals and glasses based on inversion of colloidal templates (also referred to as colloidal-based porous materials) can be used as sensors, membranes, self-cleaning surfaces, and in batteries and water purification systems [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Alumina Addition on the Optical Properties and the Thermal Stability of Titania Thin Films and Inverse Opals Produced by Atomic Layer Deposition

et al. 2021

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TiO2 thin films deposited by atomic layer deposition (ALD) at low temperatures (<100 °C) are, in general, amorphous and exhibit a smaller refractive index in comparison to their crystalline counterparts. Nonetheless, low-temperature ALD is needed when the substrates or templates are based on polymeric materials, as the deposition has to be performed below their glass transition or melting temperatures. This is the case for photonic crystals generated via ALD infiltration of self-assembled polystyrene templates. When heated up, crystal phase transformations take place in the thin films or photonic structures, and the accompanying volume reduction as well as the burn-out of residual impurities can lead to mechanical instability. The introduction of cation doping (e.g., Al or Nb) in bulk TiO2 parts is known to alter phase transitions and to stabilize crystalline phases. In this work, we have developed low-temperature ALD super-cycles to introduce Al2O3 into TiO2 thin films and photonic crystals. The aluminum oxide content was adjusted by varying the TiO2:Al2O3 internal loop ratio within the ALD super-cycle. Both thin films and inverse opal photonic crystal structures were subjected to thermal treatments ranging from 200 to 1200 °C and were characterized by in- and ex-situ X-ray diffraction, spectroscopic ellipsometry, and spectroscopic reflectance measurements. The results show that the introduction of alumina affects the crystallization and phase transition temperatures of titania as well as the optical properties of the inverse opal photonic crystals (iPhC). The thermal stability of the titania iPhCs was increased by the alumina introduction, maintaining their photonic bandgap even after heat treatment at 900 °C and outperforming the pure titania, with the best results being achieved with the super-cycles corresponding to an estimated alumina content of 26 wt.%.

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Advancing the fabrication of YSZ-inverse photonic glasses for broadband omnidirectional reflector films

Cited by 10 publications

References 43 publications

Printing Crack‐Free Microporous Structures by Combining Additive Manufacturing with Colloidal Assembly

Printing Crack‐Free Microporous Structures by Combining Additive Manufacturing with Colloidal Assembly

Unraveling the role of shell thickness and pore size on the mechanical properties of ceramic‐based macroporous structures

Influence of Alumina Addition on the Optical Properties and the Thermal Stability of Titania Thin Films and Inverse Opals Produced by Atomic Layer Deposition

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